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Finding the Fourth Proportional to 109,678.78, 151,355.55 and 61,929.30

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Solution

The fourth proportional to 109,678.78, 151,355.55 and 61,929.30 is: 85,461.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,678.78 : 151,355.55 = 61,929.30 : x
  2. Step 2: Convert to fraction form
    109,678.78/151,355.55 = 61,929.30/x
  3. Step 3: Cross multiply
    109,678.78x = 151,355.55 × 61,929.30
  4. Step 4: Simplify right side
    109,678.78x = 9,373,343,262.62
  5. Step 5: Solve for x
    x = 9,373,343,262.62/109,678.78
  6. Step 6: Final answer
    x = 85,461.78

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1.5x scale

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.