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Finding the Fourth Proportional to 424.36, 586.40 and 307.72

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Solution

The fourth proportional to 424.36, 586.40 and 307.72 is: 425.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.36 : 586.40 = 307.72 : x
  2. Step 2: Convert to fraction form
    424.36/586.40 = 307.72/x
  3. Step 3: Cross multiply
    424.36x = 586.40 × 307.72
  4. Step 4: Simplify right side
    424.36x = 180,447.01
  5. Step 5: Solve for x
    x = 180,447.01/424.36
  6. Step 6: Final answer
    x = 425.22

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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.