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Finding the Fourth Proportional to 875.63, 1,313.39 and 485.82

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Solution

The fourth proportional to 875.63, 1,313.39 and 485.82 is: 728.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.63 : 1,313.39 = 485.82 : x
  2. Step 2: Convert to fraction form
    875.63/1,313.39 = 485.82/x
  3. Step 3: Cross multiply
    875.63x = 1,313.39 × 485.82
  4. Step 4: Simplify right side
    875.63x = 638,072.34
  5. Step 5: Solve for x
    x = 638,072.34/875.63
  6. Step 6: Final answer
    x = 728.70

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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.