Home / 31,140.99-42,961.46-21,715.02

Finding the Fourth Proportional to 31,140.99, 42,961.46 and 21,715.02

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Solution

The fourth proportional to 31,140.99, 42,961.46 and 21,715.02 is: 29,957.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,140.99 : 42,961.46 = 21,715.02 : x
  2. Step 2: Convert to fraction form
    31,140.99/42,961.46 = 21,715.02/x
  3. Step 3: Cross multiply
    31,140.99x = 42,961.46 × 21,715.02
  4. Step 4: Simplify right side
    31,140.99x = 932,908,963.13
  5. Step 5: Solve for x
    x = 932,908,963.13/31,140.99
  6. Step 6: Final answer
    x = 29,957.59

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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.