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Finding the Fourth Proportional to 85,931.70, 128,897.55 and 84,765.30

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Solution

The fourth proportional to 85,931.70, 128,897.55 and 84,765.30 is: 127,147.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,931.70 : 128,897.55 = 84,765.30 : x
  2. Step 2: Convert to fraction form
    85,931.70/128,897.55 = 84,765.30/x
  3. Step 3: Cross multiply
    85,931.70x = 128,897.55 × 84,765.30
  4. Step 4: Simplify right side
    85,931.70x = 10,926,039,495.02
  5. Step 5: Solve for x
    x = 10,926,039,495.02/85,931.70
  6. Step 6: Final answer
    x = 127,147.95

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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.