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Finding the Fourth Proportional to 858.12, 1,184.10 and 485.07

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Solution

The fourth proportional to 858.12, 1,184.10 and 485.07 is: 669.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.12 : 1,184.10 = 485.07 : x
  2. Step 2: Convert to fraction form
    858.12/1,184.10 = 485.07/x
  3. Step 3: Cross multiply
    858.12x = 1,184.10 × 485.07
  4. Step 4: Simplify right side
    858.12x = 574,371.39
  5. Step 5: Solve for x
    x = 574,371.39/858.12
  6. Step 6: Final answer
    x = 669.34

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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.