Home / 712,418.49-983,159.78-390,159.18

Finding the Fourth Proportional to 712,418.49, 983,159.78 and 390,159.18

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Solution

The fourth proportional to 712,418.49, 983,159.78 and 390,159.18 is: 538,431.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,418.49 : 983,159.78 = 390,159.18 : x
  2. Step 2: Convert to fraction form
    712,418.49/983,159.78 = 390,159.18/x
  3. Step 3: Cross multiply
    712,418.49x = 983,159.78 × 390,159.18
  4. Step 4: Simplify right side
    712,418.49x = 383,588,811,622.99
  5. Step 5: Solve for x
    x = 383,588,811,622.99/712,418.49
  6. Step 6: Final answer
    x = 538,431.86

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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.