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Finding the Fourth Proportional to 438,603.40, 657,905.10 and 172,275.40

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Solution

The fourth proportional to 438,603.40, 657,905.10 and 172,275.40 is: 258,413.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,603.40 : 657,905.10 = 172,275.40 : x
  2. Step 2: Convert to fraction form
    438,603.40/657,905.10 = 172,275.40/x
  3. Step 3: Cross multiply
    438,603.40x = 657,905.10 × 172,275.40
  4. Step 4: Simplify right side
    438,603.40x = 113,340,864,264.54
  5. Step 5: Solve for x
    x = 113,340,864,264.54/438,603.40
  6. Step 6: Final answer
    x = 258,413.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.