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Finding the Fourth Proportional to 72,700.40, 100,319.64 and 42,492.80

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Solution

The fourth proportional to 72,700.40, 100,319.64 and 42,492.80 is: 58,636.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,700.40 : 100,319.64 = 42,492.80 : x
  2. Step 2: Convert to fraction form
    72,700.40/100,319.64 = 42,492.80/x
  3. Step 3: Cross multiply
    72,700.40x = 100,319.64 × 42,492.80
  4. Step 4: Simplify right side
    72,700.40x = 4,262,862,398.59
  5. Step 5: Solve for x
    x = 4,262,862,398.59/72,700.40
  6. Step 6: Final answer
    x = 58,636.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.