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Finding the Fourth Proportional to 714.15, 985.50 and 419.35

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Solution

The fourth proportional to 714.15, 985.50 and 419.35 is: 578.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.15 : 985.50 = 419.35 : x
  2. Step 2: Convert to fraction form
    714.15/985.50 = 419.35/x
  3. Step 3: Cross multiply
    714.15x = 985.50 × 419.35
  4. Step 4: Simplify right side
    714.15x = 413,269.43
  5. Step 5: Solve for x
    x = 413,269.43/714.15
  6. Step 6: Final answer
    x = 578.69

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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.