Home / 640,987.07-884,834.51-399,389.01

Finding the Fourth Proportional to 640,987.07, 884,834.51 and 399,389.01

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Solution

The fourth proportional to 640,987.07, 884,834.51 and 399,389.01 is: 551,326.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,987.07 : 884,834.51 = 399,389.01 : x
  2. Step 2: Convert to fraction form
    640,987.07/884,834.51 = 399,389.01/x
  3. Step 3: Cross multiply
    640,987.07x = 884,834.51 × 399,389.01
  4. Step 4: Simplify right side
    640,987.07x = 353,393,178,962.74
  5. Step 5: Solve for x
    x = 353,393,178,962.74/640,987.07
  6. Step 6: Final answer
    x = 551,326.53

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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.