Home / 31,715.20-47,572.80-21,270.40

Finding the Fourth Proportional to 31,715.20, 47,572.80 and 21,270.40

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Solution

The fourth proportional to 31,715.20, 47,572.80 and 21,270.40 is: 31,905.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,715.20 : 47,572.80 = 21,270.40 : x
  2. Step 2: Convert to fraction form
    31,715.20/47,572.80 = 21,270.40/x
  3. Step 3: Cross multiply
    31,715.20x = 47,572.80 × 21,270.40
  4. Step 4: Simplify right side
    31,715.20x = 1,011,892,485.12
  5. Step 5: Solve for x
    x = 1,011,892,485.12/31,715.20
  6. Step 6: Final answer
    x = 31,905.60

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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.