Home / 21,038.16-31,511.16-12,812.88

Finding the Fourth Proportional to 21,038.16, 31,511.16 and 12,812.88

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Solution

The fourth proportional to 21,038.16, 31,511.16 and 12,812.88 is: 19,191.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,038.16 : 31,511.16 = 12,812.88 : x
  2. Step 2: Convert to fraction form
    21,038.16/31,511.16 = 12,812.88/x
  3. Step 3: Cross multiply
    21,038.16x = 31,511.16 × 12,812.88
  4. Step 4: Simplify right side
    21,038.16x = 403,748,711.74
  5. Step 5: Solve for x
    x = 403,748,711.74/21,038.16
  6. Step 6: Final answer
    x = 19,191.26

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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.