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Finding the Fourth Proportional to 858.54, 1,184.85 and 648.35

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Solution

The fourth proportional to 858.54, 1,184.85 and 648.35 is: 894.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.54 : 1,184.85 = 648.35 : x
  2. Step 2: Convert to fraction form
    858.54/1,184.85 = 648.35/x
  3. Step 3: Cross multiply
    858.54x = 1,184.85 × 648.35
  4. Step 4: Simplify right side
    858.54x = 768,196.02
  5. Step 5: Solve for x
    x = 768,196.02/858.54
  6. Step 6: Final answer
    x = 894.77

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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.