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Finding the Fourth Proportional to 388,988.90, 536,284.77 and 291,779.54

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Solution

The fourth proportional to 388,988.90, 536,284.77 and 291,779.54 is: 402,265.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,988.90 : 536,284.77 = 291,779.54 : x
  2. Step 2: Convert to fraction form
    388,988.90/536,284.77 = 291,779.54/x
  3. Step 3: Cross multiply
    388,988.90x = 536,284.77 × 291,779.54
  4. Step 4: Simplify right side
    388,988.90x = 156,476,923,499.61
  5. Step 5: Solve for x
    x = 156,476,923,499.61/388,988.90
  6. Step 6: Final answer
    x = 402,265.78

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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.