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Finding the Fourth Proportional to 688.08, 947.64 and 501.24

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Solution

The fourth proportional to 688.08, 947.64 and 501.24 is: 690.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.08 : 947.64 = 501.24 : x
  2. Step 2: Convert to fraction form
    688.08/947.64 = 501.24/x
  3. Step 3: Cross multiply
    688.08x = 947.64 × 501.24
  4. Step 4: Simplify right side
    688.08x = 474,995.07
  5. Step 5: Solve for x
    x = 474,995.07/688.08
  6. Step 6: Final answer
    x = 690.32

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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.