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Finding the Fourth Proportional to 21,070.80, 31,597.56 and 7,916.13

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Solution

The fourth proportional to 21,070.80, 31,597.56 and 7,916.13 is: 11,870.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,070.80 : 31,597.56 = 7,916.13 : x
  2. Step 2: Convert to fraction form
    21,070.80/31,597.56 = 7,916.13/x
  3. Step 3: Cross multiply
    21,070.80x = 31,597.56 × 7,916.13
  4. Step 4: Simplify right side
    21,070.80x = 250,130,392.64
  5. Step 5: Solve for x
    x = 250,130,392.64/21,070.80
  6. Step 6: Final answer
    x = 11,870.95

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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.