Home / 15,385.79-21,232.39-8,312.21

Finding the Fourth Proportional to 15,385.79, 21,232.39 and 8,312.21

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Solution

The fourth proportional to 15,385.79, 21,232.39 and 8,312.21 is: 11,470.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,385.79 : 21,232.39 = 8,312.21 : x
  2. Step 2: Convert to fraction form
    15,385.79/21,232.39 = 8,312.21/x
  3. Step 3: Cross multiply
    15,385.79x = 21,232.39 × 8,312.21
  4. Step 4: Simplify right side
    15,385.79x = 176,487,978.32
  5. Step 5: Solve for x
    x = 176,487,978.32/15,385.79
  6. Step 6: Final answer
    x = 11,470.85

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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.