Home / 15,715.02-21,686.82-8,641.90

Finding the Fourth Proportional to 15,715.02, 21,686.82 and 8,641.90

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Solution

The fourth proportional to 15,715.02, 21,686.82 and 8,641.90 is: 11,925.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,715.02 : 21,686.82 = 8,641.90 : x
  2. Step 2: Convert to fraction form
    15,715.02/21,686.82 = 8,641.90/x
  3. Step 3: Cross multiply
    15,715.02x = 21,686.82 × 8,641.90
  4. Step 4: Simplify right side
    15,715.02x = 187,415,329.76
  5. Step 5: Solve for x
    x = 187,415,329.76/15,715.02
  6. Step 6: Final answer
    x = 11,925.87

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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.