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Finding the Fourth Proportional to 875.74, 1,312.56 and 388.24

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Solution

The fourth proportional to 875.74, 1,312.56 and 388.24 is: 581.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.74 : 1,312.56 = 388.24 : x
  2. Step 2: Convert to fraction form
    875.74/1,312.56 = 388.24/x
  3. Step 3: Cross multiply
    875.74x = 1,312.56 × 388.24
  4. Step 4: Simplify right side
    875.74x = 509,588.29
  5. Step 5: Solve for x
    x = 509,588.29/875.74
  6. Step 6: Final answer
    x = 581.89

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1.5x scale

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.