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Finding the Fourth Proportional to 85,430.30, 128,145.45 and 55,939.10

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Solution

The fourth proportional to 85,430.30, 128,145.45 and 55,939.10 is: 83,908.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,430.30 : 128,145.45 = 55,939.10 : x
  2. Step 2: Convert to fraction form
    85,430.30/128,145.45 = 55,939.10/x
  3. Step 3: Cross multiply
    85,430.30x = 128,145.45 × 55,939.10
  4. Step 4: Simplify right side
    85,430.30x = 7,168,341,142.10
  5. Step 5: Solve for x
    x = 7,168,341,142.10/85,430.30
  6. Step 6: Final answer
    x = 83,908.65

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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.