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Finding the Fourth Proportional to 858.13, 1,184.12 and 485.10

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Solution

The fourth proportional to 858.13, 1,184.12 and 485.10 is: 669.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.13 : 1,184.12 = 485.10 : x
  2. Step 2: Convert to fraction form
    858.13/1,184.12 = 485.10/x
  3. Step 3: Cross multiply
    858.13x = 1,184.12 × 485.10
  4. Step 4: Simplify right side
    858.13x = 574,416.61
  5. Step 5: Solve for x
    x = 574,416.61/858.13
  6. Step 6: Final answer
    x = 669.38

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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.