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Finding the Fourth Proportional to 1,399,707.46, 1,931,657.79 and 787,899.70

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Solution

The fourth proportional to 1,399,707.46, 1,931,657.79 and 787,899.70 is: 1,087,336.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399,707.46 : 1,931,657.79 = 787,899.70 : x
  2. Step 2: Convert to fraction form
    1,399,707.46/1,931,657.79 = 787,899.70/x
  3. Step 3: Cross multiply
    1,399,707.46x = 1,931,657.79 × 787,899.70
  4. Step 4: Simplify right side
    1,399,707.46x = 1,521,952,593,243.66
  5. Step 5: Solve for x
    x = 1,521,952,593,243.66/1,399,707.46
  6. Step 6: Final answer
    x = 1,087,336.20

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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.