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Finding the Fourth Proportional to 647.21, 893.59 and 497.57

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Solution

The fourth proportional to 647.21, 893.59 and 497.57 is: 686.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.21 : 893.59 = 497.57 : x
  2. Step 2: Convert to fraction form
    647.21/893.59 = 497.57/x
  3. Step 3: Cross multiply
    647.21x = 893.59 × 497.57
  4. Step 4: Simplify right side
    647.21x = 444,627.02
  5. Step 5: Solve for x
    x = 444,627.02/647.21
  6. Step 6: Final answer
    x = 686.99

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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.