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Finding the Fourth Proportional to 677,920.32, 935,263.26 and 391,384.98

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Solution

The fourth proportional to 677,920.32, 935,263.26 and 391,384.98 is: 539,957.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,920.32 : 935,263.26 = 391,384.98 : x
  2. Step 2: Convert to fraction form
    677,920.32/935,263.26 = 391,384.98/x
  3. Step 3: Cross multiply
    677,920.32x = 935,263.26 × 391,384.98
  4. Step 4: Simplify right side
    677,920.32x = 366,047,992,309.84
  5. Step 5: Solve for x
    x = 366,047,992,309.84/677,920.32
  6. Step 6: Final answer
    x = 539,957.25

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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.