Home / 716,983.40-989,449.76-390,305.86

Finding the Fourth Proportional to 716,983.40, 989,449.76 and 390,305.86

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Solution

The fourth proportional to 716,983.40, 989,449.76 and 390,305.86 is: 538,628.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,983.40 : 989,449.76 = 390,305.86 : x
  2. Step 2: Convert to fraction form
    716,983.40/989,449.76 = 390,305.86/x
  3. Step 3: Cross multiply
    716,983.40x = 989,449.76 × 390,305.86
  4. Step 4: Simplify right side
    716,983.40x = 386,188,039,503.59
  5. Step 5: Solve for x
    x = 386,188,039,503.59/716,983.40
  6. Step 6: Final answer
    x = 538,628.98

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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.