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Finding the Fourth Proportional to 21,510.70, 29,686.77 and 13,014.91

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Solution

The fourth proportional to 21,510.70, 29,686.77 and 13,014.91 is: 17,961.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,510.70 : 29,686.77 = 13,014.91 : x
  2. Step 2: Convert to fraction form
    21,510.70/29,686.77 = 13,014.91/x
  3. Step 3: Cross multiply
    21,510.70x = 29,686.77 × 13,014.91
  4. Step 4: Simplify right side
    21,510.70x = 386,370,491.31
  5. Step 5: Solve for x
    x = 386,370,491.31/21,510.70
  6. Step 6: Final answer
    x = 17,961.79

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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.