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Finding the Fourth Proportional to 875.13, 1,312.21 and 435.41

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Solution

The fourth proportional to 875.13, 1,312.21 and 435.41 is: 652.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.13 : 1,312.21 = 435.41 : x
  2. Step 2: Convert to fraction form
    875.13/1,312.21 = 435.41/x
  3. Step 3: Cross multiply
    875.13x = 1,312.21 × 435.41
  4. Step 4: Simplify right side
    875.13x = 571,349.36
  5. Step 5: Solve for x
    x = 571,349.36/875.13
  6. Step 6: Final answer
    x = 652.88

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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.