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Finding the Fourth Proportional to 875.02, 1,312.40 and 485.42

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Solution

The fourth proportional to 875.02, 1,312.40 and 485.42 is: 728.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.02 : 1,312.40 = 485.42 : x
  2. Step 2: Convert to fraction form
    875.02/1,312.40 = 485.42/x
  3. Step 3: Cross multiply
    875.02x = 1,312.40 × 485.42
  4. Step 4: Simplify right side
    875.02x = 637,065.21
  5. Step 5: Solve for x
    x = 637,065.21/875.02
  6. Step 6: Final answer
    x = 728.06

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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.