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Finding the Fourth Proportional to 666.93, 919.65 and 509.59

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Solution

The fourth proportional to 666.93, 919.65 and 509.59 is: 702.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.93 : 919.65 = 509.59 : x
  2. Step 2: Convert to fraction form
    666.93/919.65 = 509.59/x
  3. Step 3: Cross multiply
    666.93x = 919.65 × 509.59
  4. Step 4: Simplify right side
    666.93x = 468,647.50
  5. Step 5: Solve for x
    x = 468,647.50/666.93
  6. Step 6: Final answer
    x = 702.69

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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.