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Finding the Fourth Proportional to 875.58, 1,312.45 and 388.57

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Solution

The fourth proportional to 875.58, 1,312.45 and 388.57 is: 582.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.58 : 1,312.45 = 388.57 : x
  2. Step 2: Convert to fraction form
    875.58/1,312.45 = 388.57/x
  3. Step 3: Cross multiply
    875.58x = 1,312.45 × 388.57
  4. Step 4: Simplify right side
    875.58x = 509,978.70
  5. Step 5: Solve for x
    x = 509,978.70/875.58
  6. Step 6: Final answer
    x = 582.45

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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.