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Finding the Fourth Proportional to 85,710.30, 128,565.45 and 30,306.30

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Solution

The fourth proportional to 85,710.30, 128,565.45 and 30,306.30 is: 45,459.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,710.30 : 128,565.45 = 30,306.30 : x
  2. Step 2: Convert to fraction form
    85,710.30/128,565.45 = 30,306.30/x
  3. Step 3: Cross multiply
    85,710.30x = 128,565.45 × 30,306.30
  4. Step 4: Simplify right side
    85,710.30x = 3,896,343,097.34
  5. Step 5: Solve for x
    x = 3,896,343,097.34/85,710.30
  6. Step 6: Final answer
    x = 45,459.45

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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.