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Finding the Fourth Proportional to 42,390, 63,596.34 and 14,688

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Solution

The fourth proportional to 42,390, 63,596.34 and 14,688 is: 22,035.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,390 : 63,596.34 = 14,688 : x
  2. Step 2: Convert to fraction form
    42,390/63,596.34 = 14,688/x
  3. Step 3: Cross multiply
    42,390x = 63,596.34 × 14,688
  4. Step 4: Simplify right side
    42,390x = 934,103,041.92
  5. Step 5: Solve for x
    x = 934,103,041.92/42,390
  6. Step 6: Final answer
    x = 22,035.93

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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.