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Finding the Fourth Proportional to 520,055.10, 780,082.65 and 253,986.30

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Solution

The fourth proportional to 520,055.10, 780,082.65 and 253,986.30 is: 380,979.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,055.10 : 780,082.65 = 253,986.30 : x
  2. Step 2: Convert to fraction form
    520,055.10/780,082.65 = 253,986.30/x
  3. Step 3: Cross multiply
    520,055.10x = 780,082.65 × 253,986.30
  4. Step 4: Simplify right side
    520,055.10x = 198,130,305,967.70
  5. Step 5: Solve for x
    x = 198,130,305,967.70/520,055.10
  6. Step 6: Final answer
    x = 380,979.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.