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Finding the Fourth Proportional to 85,909.40, 128,864.10 and 36,045.80

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Solution

The fourth proportional to 85,909.40, 128,864.10 and 36,045.80 is: 54,068.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,909.40 : 128,864.10 = 36,045.80 : x
  2. Step 2: Convert to fraction form
    85,909.40/128,864.10 = 36,045.80/x
  3. Step 3: Cross multiply
    85,909.40x = 128,864.10 × 36,045.80
  4. Step 4: Simplify right side
    85,909.40x = 4,645,009,575.78
  5. Step 5: Solve for x
    x = 4,645,009,575.78/85,909.40
  6. Step 6: Final answer
    x = 54,068.70

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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.