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Finding the Fourth Proportional to 858.45, 1,184.69 and 485.49

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Solution

The fourth proportional to 858.45, 1,184.69 and 485.49 is: 669.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.45 : 1,184.69 = 485.49 : x
  2. Step 2: Convert to fraction form
    858.45/1,184.69 = 485.49/x
  3. Step 3: Cross multiply
    858.45x = 1,184.69 × 485.49
  4. Step 4: Simplify right side
    858.45x = 575,151.41
  5. Step 5: Solve for x
    x = 575,151.41/858.45
  6. Step 6: Final answer
    x = 669.99

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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.