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Finding the Fourth Proportional to 716,235.36, 988,405.31 and 393,969.98

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Solution

The fourth proportional to 716,235.36, 988,405.31 and 393,969.98 is: 543,678.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,235.36 : 988,405.31 = 393,969.98 : x
  2. Step 2: Convert to fraction form
    716,235.36/988,405.31 = 393,969.98/x
  3. Step 3: Cross multiply
    716,235.36x = 988,405.31 × 393,969.98
  4. Step 4: Simplify right side
    716,235.36x = 389,402,017,000.71
  5. Step 5: Solve for x
    x = 389,402,017,000.71/716,235.36
  6. Step 6: Final answer
    x = 543,678.85

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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.