Home / 31,428.90-47,136.06-13,889.16

Finding the Fourth Proportional to 31,428.90, 47,136.06 and 13,889.16

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Solution

The fourth proportional to 31,428.90, 47,136.06 and 13,889.16 is: 20,830.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,428.90 : 47,136.06 = 13,889.16 : x
  2. Step 2: Convert to fraction form
    31,428.90/47,136.06 = 13,889.16/x
  3. Step 3: Cross multiply
    31,428.90x = 47,136.06 × 13,889.16
  4. Step 4: Simplify right side
    31,428.90x = 654,680,279.11
  5. Step 5: Solve for x
    x = 654,680,279.11/31,428.90
  6. Step 6: Final answer
    x = 20,830.52

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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.