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Finding the Fourth Proportional to 111,390, 153,718.20 and 61,089

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Solution

The fourth proportional to 111,390, 153,718.20 and 61,089 is: 84,302.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,390 : 153,718.20 = 61,089 : x
  2. Step 2: Convert to fraction form
    111,390/153,718.20 = 61,089/x
  3. Step 3: Cross multiply
    111,390x = 153,718.20 × 61,089
  4. Step 4: Simplify right side
    111,390x = 9,390,491,119.80
  5. Step 5: Solve for x
    x = 9,390,491,119.80/111,390
  6. Step 6: Final answer
    x = 84,302.82

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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.