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Finding the Fourth Proportional to 86,575.20, 129,862.80 and 47,209.20

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Solution

The fourth proportional to 86,575.20, 129,862.80 and 47,209.20 is: 70,813.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,575.20 : 129,862.80 = 47,209.20 : x
  2. Step 2: Convert to fraction form
    86,575.20/129,862.80 = 47,209.20/x
  3. Step 3: Cross multiply
    86,575.20x = 129,862.80 × 47,209.20
  4. Step 4: Simplify right side
    86,575.20x = 6,130,718,897.76
  5. Step 5: Solve for x
    x = 6,130,718,897.76/86,575.20
  6. Step 6: Final answer
    x = 70,813.80

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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.