Home / 12,312.90-18,450.45-9,178.20

Finding the Fourth Proportional to 12,312.90, 18,450.45 and 9,178.20

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Solution

The fourth proportional to 12,312.90, 18,450.45 and 9,178.20 is: 13,753.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,312.90 : 18,450.45 = 9,178.20 : x
  2. Step 2: Convert to fraction form
    12,312.90/18,450.45 = 9,178.20/x
  3. Step 3: Cross multiply
    12,312.90x = 18,450.45 × 9,178.20
  4. Step 4: Simplify right side
    12,312.90x = 169,341,920.19
  5. Step 5: Solve for x
    x = 169,341,920.19/12,312.90
  6. Step 6: Final answer
    x = 13,753.21

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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.