Home / 640,985.18-884,831.91-399,387.12

Finding the Fourth Proportional to 640,985.18, 884,831.91 and 399,387.12

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Solution

The fourth proportional to 640,985.18, 884,831.91 and 399,387.12 is: 551,323.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,985.18 : 884,831.91 = 399,387.12 : x
  2. Step 2: Convert to fraction form
    640,985.18/884,831.91 = 399,387.12/x
  3. Step 3: Cross multiply
    640,985.18x = 884,831.91 × 399,387.12
  4. Step 4: Simplify right side
    640,985.18x = 353,390,465,770.75
  5. Step 5: Solve for x
    x = 353,390,465,770.75/640,985.18
  6. Step 6: Final answer
    x = 551,323.93

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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.