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Finding the Fourth Proportional to 718,368.86, 991,356.79 and 391,679.18

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Solution

The fourth proportional to 718,368.86, 991,356.79 and 391,679.18 is: 540,521.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,368.86 : 991,356.79 = 391,679.18 : x
  2. Step 2: Convert to fraction form
    718,368.86/991,356.79 = 391,679.18/x
  3. Step 3: Cross multiply
    718,368.86x = 991,356.79 × 391,679.18
  4. Step 4: Simplify right side
    718,368.86x = 388,293,814,594.63
  5. Step 5: Solve for x
    x = 388,293,814,594.63/718,368.86
  6. Step 6: Final answer
    x = 540,521.50

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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.