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Finding the Fourth Proportional to 679,428.39, 937,702.13 and 438,411.68

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Solution

The fourth proportional to 679,428.39, 937,702.13 and 438,411.68 is: 605,066.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    679,428.39 : 937,702.13 = 438,411.68 : x
  2. Step 2: Convert to fraction form
    679,428.39/937,702.13 = 438,411.68/x
  3. Step 3: Cross multiply
    679,428.39x = 937,702.13 × 438,411.68
  4. Step 4: Simplify right side
    679,428.39x = 411,099,566,152.88
  5. Step 5: Solve for x
    x = 411,099,566,152.88/679,428.39
  6. Step 6: Final answer
    x = 605,066.81

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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.