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Finding the Fourth Proportional to 664,156.67, 916,373.16 and 388,471.64

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Solution

The fourth proportional to 664,156.67, 916,373.16 and 388,471.64 is: 535,995.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,156.67 : 916,373.16 = 388,471.64 : x
  2. Step 2: Convert to fraction form
    664,156.67/916,373.16 = 388,471.64/x
  3. Step 3: Cross multiply
    664,156.67x = 916,373.16 × 388,471.64
  4. Step 4: Simplify right side
    664,156.67x = 355,984,984,317.18
  5. Step 5: Solve for x
    x = 355,984,984,317.18/664,156.67
  6. Step 6: Final answer
    x = 535,995.50

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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.