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Finding the Fourth Proportional to 308,966.16, 426,361.48 and 172,987.40

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Solution

The fourth proportional to 308,966.16, 426,361.48 and 172,987.40 is: 238,715.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,966.16 : 426,361.48 = 172,987.40 : x
  2. Step 2: Convert to fraction form
    308,966.16/426,361.48 = 172,987.40/x
  3. Step 3: Cross multiply
    308,966.16x = 426,361.48 × 172,987.40
  4. Step 4: Simplify right side
    308,966.16x = 73,755,163,885.35
  5. Step 5: Solve for x
    x = 73,755,163,885.35/308,966.16
  6. Step 6: Final answer
    x = 238,715.99

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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.