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Finding the Fourth Proportional to 714.15, 985.71 and 434.40

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Solution

The fourth proportional to 714.15, 985.71 and 434.40 is: 599.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.15 : 985.71 = 434.40 : x
  2. Step 2: Convert to fraction form
    714.15/985.71 = 434.40/x
  3. Step 3: Cross multiply
    714.15x = 985.71 × 434.40
  4. Step 4: Simplify right side
    714.15x = 428,192.42
  5. Step 5: Solve for x
    x = 428,192.42/714.15
  6. Step 6: Final answer
    x = 599.58

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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.