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Finding the Fourth Proportional to 64,854.90, 89,486.12 and 39,374.66

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Solution

The fourth proportional to 64,854.90, 89,486.12 and 39,374.66 is: 54,328.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,854.90 : 89,486.12 = 39,374.66 : x
  2. Step 2: Convert to fraction form
    64,854.90/89,486.12 = 39,374.66/x
  3. Step 3: Cross multiply
    64,854.90x = 89,486.12 × 39,374.66
  4. Step 4: Simplify right side
    64,854.90x = 3,523,484,905.42
  5. Step 5: Solve for x
    x = 3,523,484,905.42/64,854.90
  6. Step 6: Final answer
    x = 54,328.74

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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.