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Finding the Fourth Proportional to 647.60, 971.40 and 503.60

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Solution

The fourth proportional to 647.60, 971.40 and 503.60 is: 755.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.60 : 971.40 = 503.60 : x
  2. Step 2: Convert to fraction form
    647.60/971.40 = 503.60/x
  3. Step 3: Cross multiply
    647.60x = 971.40 × 503.60
  4. Step 4: Simplify right side
    647.60x = 489,197.04
  5. Step 5: Solve for x
    x = 489,197.04/647.60
  6. Step 6: Final answer
    x = 755.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.