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Finding the Fourth Proportional to 90,646.80, 135,970.20 and 77,233.20

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Solution

The fourth proportional to 90,646.80, 135,970.20 and 77,233.20 is: 115,849.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,646.80 : 135,970.20 = 77,233.20 : x
  2. Step 2: Convert to fraction form
    90,646.80/135,970.20 = 77,233.20/x
  3. Step 3: Cross multiply
    90,646.80x = 135,970.20 × 77,233.20
  4. Step 4: Simplify right side
    90,646.80x = 10,501,413,650.64
  5. Step 5: Solve for x
    x = 10,501,413,650.64/90,646.80
  6. Step 6: Final answer
    x = 115,849.80

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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.