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Finding the Fourth Proportional to 71,315.40, 106,886.70 and 31,830.60

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Solution

The fourth proportional to 71,315.40, 106,886.70 and 31,830.60 is: 47,707.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,315.40 : 106,886.70 = 31,830.60 : x
  2. Step 2: Convert to fraction form
    71,315.40/106,886.70 = 31,830.60/x
  3. Step 3: Cross multiply
    71,315.40x = 106,886.70 × 31,830.60
  4. Step 4: Simplify right side
    71,315.40x = 3,402,267,793.02
  5. Step 5: Solve for x
    x = 3,402,267,793.02/71,315.40
  6. Step 6: Final answer
    x = 47,707.34

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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.