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Finding the Fourth Proportional to 356.61, 491.13 and 307.47

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Solution

The fourth proportional to 356.61, 491.13 and 307.47 is: 423.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.61 : 491.13 = 307.47 : x
  2. Step 2: Convert to fraction form
    356.61/491.13 = 307.47/x
  3. Step 3: Cross multiply
    356.61x = 491.13 × 307.47
  4. Step 4: Simplify right side
    356.61x = 151,007.74
  5. Step 5: Solve for x
    x = 151,007.74/356.61
  6. Step 6: Final answer
    x = 423.45

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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.