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Finding the Fourth Proportional to 875.30, 1,207.50 and 612.86

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Solution

The fourth proportional to 875.30, 1,207.50 and 612.86 is: 845.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.30 : 1,207.50 = 612.86 : x
  2. Step 2: Convert to fraction form
    875.30/1,207.50 = 612.86/x
  3. Step 3: Cross multiply
    875.30x = 1,207.50 × 612.86
  4. Step 4: Simplify right side
    875.30x = 740,028.45
  5. Step 5: Solve for x
    x = 740,028.45/875.30
  6. Step 6: Final answer
    x = 845.46

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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.