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Finding the Fourth Proportional to 858.69, 1,184.99 and 485.65

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Solution

The fourth proportional to 858.69, 1,184.99 and 485.65 is: 670.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.69 : 1,184.99 = 485.65 : x
  2. Step 2: Convert to fraction form
    858.69/1,184.99 = 485.65/x
  3. Step 3: Cross multiply
    858.69x = 1,184.99 × 485.65
  4. Step 4: Simplify right side
    858.69x = 575,490.39
  5. Step 5: Solve for x
    x = 575,490.39/858.69
  6. Step 6: Final answer
    x = 670.20

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Double scale
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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.