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Finding the Fourth Proportional to 21,140, 29,095.52 and 18,121.94

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Solution

The fourth proportional to 21,140, 29,095.52 and 18,121.94 is: 24,941.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,140 : 29,095.52 = 18,121.94 : x
  2. Step 2: Convert to fraction form
    21,140/29,095.52 = 18,121.94/x
  3. Step 3: Cross multiply
    21,140x = 29,095.52 × 18,121.94
  4. Step 4: Simplify right side
    21,140x = 527,267,267.71
  5. Step 5: Solve for x
    x = 527,267,267.71/21,140
  6. Step 6: Final answer
    x = 24,941.69

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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.