Home / 712,418.23-983,107.63-390,122.78

Finding the Fourth Proportional to 712,418.23, 983,107.63 and 390,122.78

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Solution

The fourth proportional to 712,418.23, 983,107.63 and 390,122.78 is: 538,353.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,418.23 : 983,107.63 = 390,122.78 : x
  2. Step 2: Convert to fraction form
    712,418.23/983,107.63 = 390,122.78/x
  3. Step 3: Cross multiply
    712,418.23x = 983,107.63 × 390,122.78
  4. Step 4: Simplify right side
    712,418.23x = 383,532,676,739.27
  5. Step 5: Solve for x
    x = 383,532,676,739.27/712,418.23
  6. Step 6: Final answer
    x = 538,353.26

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1.5x scale

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.