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Finding the Fourth Proportional to 21,275.70, 31,913.55 and 7,424.70

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Solution

The fourth proportional to 21,275.70, 31,913.55 and 7,424.70 is: 11,137.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,275.70 : 31,913.55 = 7,424.70 : x
  2. Step 2: Convert to fraction form
    21,275.70/31,913.55 = 7,424.70/x
  3. Step 3: Cross multiply
    21,275.70x = 31,913.55 × 7,424.70
  4. Step 4: Simplify right side
    21,275.70x = 236,948,534.69
  5. Step 5: Solve for x
    x = 236,948,534.69/21,275.70
  6. Step 6: Final answer
    x = 11,137.05

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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.