Home / 15,710.90-21,681.20-8,637.78

Finding the Fourth Proportional to 15,710.90, 21,681.20 and 8,637.78

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Solution

The fourth proportional to 15,710.90, 21,681.20 and 8,637.78 is: 11,920.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,710.90 : 21,681.20 = 8,637.78 : x
  2. Step 2: Convert to fraction form
    15,710.90/21,681.20 = 8,637.78/x
  3. Step 3: Cross multiply
    15,710.90x = 21,681.20 × 8,637.78
  4. Step 4: Simplify right side
    15,710.90x = 187,277,392.55
  5. Step 5: Solve for x
    x = 187,277,392.55/15,710.90
  6. Step 6: Final answer
    x = 11,920.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.