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Finding the Fourth Proportional to 18,369.40, 25,349.07 and 9,985.90

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Solution

The fourth proportional to 18,369.40, 25,349.07 and 9,985.90 is: 13,780.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,369.40 : 25,349.07 = 9,985.90 : x
  2. Step 2: Convert to fraction form
    18,369.40/25,349.07 = 9,985.90/x
  3. Step 3: Cross multiply
    18,369.40x = 25,349.07 × 9,985.90
  4. Step 4: Simplify right side
    18,369.40x = 253,133,278.11
  5. Step 5: Solve for x
    x = 253,133,278.11/18,369.40
  6. Step 6: Final answer
    x = 13,780.16

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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.