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Finding the Fourth Proportional to 308,774.40, 426,116.24 and 172,807.28

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Solution

The fourth proportional to 308,774.40, 426,116.24 and 172,807.28 is: 238,478.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,774.40 : 426,116.24 = 172,807.28 : x
  2. Step 2: Convert to fraction form
    308,774.40/426,116.24 = 172,807.28/x
  3. Step 3: Cross multiply
    308,774.40x = 426,116.24 × 172,807.28
  4. Step 4: Simplify right side
    308,774.40x = 73,635,988,398.23
  5. Step 5: Solve for x
    x = 73,635,988,398.23/308,774.40
  6. Step 6: Final answer
    x = 238,478.28

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1.5x scale

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.