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Finding the Fourth Proportional to 660,785.10, 989,865.45 and 393,752.40

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Solution

The fourth proportional to 660,785.10, 989,865.45 and 393,752.40 is: 589,846.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,785.10 : 989,865.45 = 393,752.40 : x
  2. Step 2: Convert to fraction form
    660,785.10/989,865.45 = 393,752.40/x
  3. Step 3: Cross multiply
    660,785.10x = 989,865.45 × 393,752.40
  4. Step 4: Simplify right side
    660,785.10x = 389,761,896,614.58
  5. Step 5: Solve for x
    x = 389,761,896,614.58/660,785.10
  6. Step 6: Final answer
    x = 589,846.68

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.