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Finding the Fourth Proportional to 520,077.80, 780,116.70 and 425,599.40

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Solution

The fourth proportional to 520,077.80, 780,116.70 and 425,599.40 is: 638,399.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,077.80 : 780,116.70 = 425,599.40 : x
  2. Step 2: Convert to fraction form
    520,077.80/780,116.70 = 425,599.40/x
  3. Step 3: Cross multiply
    520,077.80x = 780,116.70 × 425,599.40
  4. Step 4: Simplify right side
    520,077.80x = 332,017,199,449.98
  5. Step 5: Solve for x
    x = 332,017,199,449.98/520,077.80
  6. Step 6: Final answer
    x = 638,399.10

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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.