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Finding the Fourth Proportional to 528.75, 730.08 and 418.86

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Solution

The fourth proportional to 528.75, 730.08 and 418.86 is: 578.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.75 : 730.08 = 418.86 : x
  2. Step 2: Convert to fraction form
    528.75/730.08 = 418.86/x
  3. Step 3: Cross multiply
    528.75x = 730.08 × 418.86
  4. Step 4: Simplify right side
    528.75x = 305,801.31
  5. Step 5: Solve for x
    x = 305,801.31/528.75
  6. Step 6: Final answer
    x = 578.35

Related Problems

Find fourth proportional to 264.38, 365.04 and 209.43
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Double scale
Find fourth proportional to 529.75, 731.46 and 419.86
Similar ratio
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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.