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Finding the Fourth Proportional to 66,862.18, 100,308.80 and 19,478.40

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Solution

The fourth proportional to 66,862.18, 100,308.80 and 19,478.40 is: 29,222.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,862.18 : 100,308.80 = 19,478.40 : x
  2. Step 2: Convert to fraction form
    66,862.18/100,308.80 = 19,478.40/x
  3. Step 3: Cross multiply
    66,862.18x = 100,308.80 × 19,478.40
  4. Step 4: Simplify right side
    66,862.18x = 1,953,854,929.92
  5. Step 5: Solve for x
    x = 1,953,854,929.92/66,862.18
  6. Step 6: Final answer
    x = 29,222.12

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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.