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Finding the Fourth Proportional to 100,978.40, 139,360.56 and 60,705.20

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Solution

The fourth proportional to 100,978.40, 139,360.56 and 60,705.20 is: 83,779.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,978.40 : 139,360.56 = 60,705.20 : x
  2. Step 2: Convert to fraction form
    100,978.40/139,360.56 = 60,705.20/x
  3. Step 3: Cross multiply
    100,978.40x = 139,360.56 × 60,705.20
  4. Step 4: Simplify right side
    100,978.40x = 8,459,910,666.91
  5. Step 5: Solve for x
    x = 8,459,910,666.91/100,978.40
  6. Step 6: Final answer
    x = 83,779.41

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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.