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Finding the Fourth Proportional to 717,681.30, 990,444.93 and 395,391.33

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Solution

The fourth proportional to 717,681.30, 990,444.93 and 395,391.33 is: 545,664.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,681.30 : 990,444.93 = 395,391.33 : x
  2. Step 2: Convert to fraction form
    717,681.30/990,444.93 = 395,391.33/x
  3. Step 3: Cross multiply
    717,681.30x = 990,444.93 × 395,391.33
  4. Step 4: Simplify right side
    717,681.30x = 391,613,338,164.46
  5. Step 5: Solve for x
    x = 391,613,338,164.46/717,681.30
  6. Step 6: Final answer
    x = 545,664.68

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1.5x scale

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.