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Finding the Fourth Proportional to 660,739.92, 991,075.86 and 387,337.91

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Solution

The fourth proportional to 660,739.92, 991,075.86 and 387,337.91 is: 580,986.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,739.92 : 991,075.86 = 387,337.91 : x
  2. Step 2: Convert to fraction form
    660,739.92/991,075.86 = 387,337.91/x
  3. Step 3: Cross multiply
    660,739.92x = 991,075.86 × 387,337.91
  4. Step 4: Simplify right side
    660,739.92x = 383,881,247,308.47
  5. Step 5: Solve for x
    x = 383,881,247,308.47/660,739.92
  6. Step 6: Final answer
    x = 580,986.91

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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.