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Finding the Fourth Proportional to 31,689.60, 47,476.80 and 19,363.20

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Solution

The fourth proportional to 31,689.60, 47,476.80 and 19,363.20 is: 29,009.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,689.60 : 47,476.80 = 19,363.20 : x
  2. Step 2: Convert to fraction form
    31,689.60/47,476.80 = 19,363.20/x
  3. Step 3: Cross multiply
    31,689.60x = 47,476.80 × 19,363.20
  4. Step 4: Simplify right side
    31,689.60x = 919,302,773.76
  5. Step 5: Solve for x
    x = 919,302,773.76/31,689.60
  6. Step 6: Final answer
    x = 29,009.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.