Home / 19,985.20-29,981.40-9,995.15

Finding the Fourth Proportional to 19,985.20, 29,981.40 and 9,995.15

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Solution

The fourth proportional to 19,985.20, 29,981.40 and 9,995.15 is: 14,994.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,985.20 : 29,981.40 = 9,995.15 : x
  2. Step 2: Convert to fraction form
    19,985.20/29,981.40 = 9,995.15/x
  3. Step 3: Cross multiply
    19,985.20x = 29,981.40 × 9,995.15
  4. Step 4: Simplify right side
    19,985.20x = 299,668,540.23
  5. Step 5: Solve for x
    x = 299,668,540.23/19,985.20
  6. Step 6: Final answer
    x = 14,994.53

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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.