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Finding the Fourth Proportional to 875.15, 1,312.78 and 290.12

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Solution

The fourth proportional to 875.15, 1,312.78 and 290.12 is: 435.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.15 : 1,312.78 = 290.12 : x
  2. Step 2: Convert to fraction form
    875.15/1,312.78 = 290.12/x
  3. Step 3: Cross multiply
    875.15x = 1,312.78 × 290.12
  4. Step 4: Simplify right side
    875.15x = 380,866.29
  5. Step 5: Solve for x
    x = 380,866.29/875.15
  6. Step 6: Final answer
    x = 435.20

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Double scale
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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.