Home / 15,518.90-21,412.40-9,145.85

Finding the Fourth Proportional to 15,518.90, 21,412.40 and 9,145.85

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Solution

The fourth proportional to 15,518.90, 21,412.40 and 9,145.85 is: 12,619.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,518.90 : 21,412.40 = 9,145.85 : x
  2. Step 2: Convert to fraction form
    15,518.90/21,412.40 = 9,145.85/x
  3. Step 3: Cross multiply
    15,518.90x = 21,412.40 × 9,145.85
  4. Step 4: Simplify right side
    15,518.90x = 195,834,445.75
  5. Step 5: Solve for x
    x = 195,834,445.75/15,518.90
  6. Step 6: Final answer
    x = 12,619.10

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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.