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Finding the Fourth Proportional to 423,547.80, 635,399.66 and 139,254.40

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Solution

The fourth proportional to 423,547.80, 635,399.66 and 139,254.40 is: 208,907.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,547.80 : 635,399.66 = 139,254.40 : x
  2. Step 2: Convert to fraction form
    423,547.80/635,399.66 = 139,254.40/x
  3. Step 3: Cross multiply
    423,547.80x = 635,399.66 × 139,254.40
  4. Step 4: Simplify right side
    423,547.80x = 88,482,198,413.50
  5. Step 5: Solve for x
    x = 88,482,198,413.50/423,547.80
  6. Step 6: Final answer
    x = 208,907.23

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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.