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Finding the Fourth Proportional to 715,991.64, 988,093.86 and 393,726.24

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Solution

The fourth proportional to 715,991.64, 988,093.86 and 393,726.24 is: 543,356.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,991.64 : 988,093.86 = 393,726.24 : x
  2. Step 2: Convert to fraction form
    715,991.64/988,093.86 = 393,726.24/x
  3. Step 3: Cross multiply
    715,991.64x = 988,093.86 × 393,726.24
  4. Step 4: Simplify right side
    715,991.64x = 389,038,480,264.89
  5. Step 5: Solve for x
    x = 389,038,480,264.89/715,991.64
  6. Step 6: Final answer
    x = 543,356.18

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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.