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Finding the Fourth Proportional to 858.08, 1,287.16 and 424.96

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Solution

The fourth proportional to 858.08, 1,287.16 and 424.96 is: 637.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.08 : 1,287.16 = 424.96 : x
  2. Step 2: Convert to fraction form
    858.08/1,287.16 = 424.96/x
  3. Step 3: Cross multiply
    858.08x = 1,287.16 × 424.96
  4. Step 4: Simplify right side
    858.08x = 546,991.51
  5. Step 5: Solve for x
    x = 546,991.51/858.08
  6. Step 6: Final answer
    x = 637.46

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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.