Home / 85,931.40-128,897.10-72,153.30

Finding the Fourth Proportional to 85,931.40, 128,897.10 and 72,153.30

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Solution

The fourth proportional to 85,931.40, 128,897.10 and 72,153.30 is: 108,229.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,931.40 : 128,897.10 = 72,153.30 : x
  2. Step 2: Convert to fraction form
    85,931.40/128,897.10 = 72,153.30/x
  3. Step 3: Cross multiply
    85,931.40x = 128,897.10 × 72,153.30
  4. Step 4: Simplify right side
    85,931.40x = 9,300,351,125.43
  5. Step 5: Solve for x
    x = 9,300,351,125.43/85,931.40
  6. Step 6: Final answer
    x = 108,229.95

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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.