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Finding the Fourth Proportional to 310,488.40, 428,509.72 and 172,681.32

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Solution

The fourth proportional to 310,488.40, 428,509.72 and 172,681.32 is: 238,320.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,488.40 : 428,509.72 = 172,681.32 : x
  2. Step 2: Convert to fraction form
    310,488.40/428,509.72 = 172,681.32/x
  3. Step 3: Cross multiply
    310,488.40x = 428,509.72 × 172,681.32
  4. Step 4: Simplify right side
    310,488.40x = 73,995,624,082.43
  5. Step 5: Solve for x
    x = 73,995,624,082.43/310,488.40
  6. Step 6: Final answer
    x = 238,320.09

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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.