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Finding the Fourth Proportional to 875.07, 1,312.81 and 485.44

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Solution

The fourth proportional to 875.07, 1,312.81 and 485.44 is: 728.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.07 : 1,312.81 = 485.44 : x
  2. Step 2: Convert to fraction form
    875.07/1,312.81 = 485.44/x
  3. Step 3: Cross multiply
    875.07x = 1,312.81 × 485.44
  4. Step 4: Simplify right side
    875.07x = 637,285.99
  5. Step 5: Solve for x
    x = 637,285.99/875.07
  6. Step 6: Final answer
    x = 728.27

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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.