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Finding the Fourth Proportional to 318,620.64, 439,708.20 and 175,386.72

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Solution

The fourth proportional to 318,620.64, 439,708.20 and 175,386.72 is: 242,040.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,620.64 : 439,708.20 = 175,386.72 : x
  2. Step 2: Convert to fraction form
    318,620.64/439,708.20 = 175,386.72/x
  3. Step 3: Cross multiply
    318,620.64x = 439,708.20 × 175,386.72
  4. Step 4: Simplify right side
    318,620.64x = 77,118,978,955.10
  5. Step 5: Solve for x
    x = 77,118,978,955.10/318,620.64
  6. Step 6: Final answer
    x = 242,040.12

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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.