Home / 718,365.12-991,339.20-391,678.08

Finding the Fourth Proportional to 718,365.12, 991,339.20 and 391,678.08

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Solution

The fourth proportional to 718,365.12, 991,339.20 and 391,678.08 is: 540,513.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,365.12 : 991,339.20 = 391,678.08 : x
  2. Step 2: Convert to fraction form
    718,365.12/991,339.20 = 391,678.08/x
  3. Step 3: Cross multiply
    718,365.12x = 991,339.20 × 391,678.08
  4. Step 4: Simplify right side
    718,365.12x = 388,285,834,484.74
  5. Step 5: Solve for x
    x = 388,285,834,484.74/718,365.12
  6. Step 6: Final answer
    x = 540,513.21

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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.