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Finding the Fourth Proportional to 714.63, 985.86 and 557.00

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Solution

The fourth proportional to 714.63, 985.86 and 557.00 is: 768.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.63 : 985.86 = 557.00 : x
  2. Step 2: Convert to fraction form
    714.63/985.86 = 557.00/x
  3. Step 3: Cross multiply
    714.63x = 985.86 × 557.00
  4. Step 4: Simplify right side
    714.63x = 549,119.09
  5. Step 5: Solve for x
    x = 549,119.09/714.63
  6. Step 6: Final answer
    x = 768.40

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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.