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Finding the Fourth Proportional to 917.43, 1,263.60 and 720.60

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Solution

The fourth proportional to 917.43, 1,263.60 and 720.60 is: 992.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.43 : 1,263.60 = 720.60 : x
  2. Step 2: Convert to fraction form
    917.43/1,263.60 = 720.60/x
  3. Step 3: Cross multiply
    917.43x = 1,263.60 × 720.60
  4. Step 4: Simplify right side
    917.43x = 910,545.42
  5. Step 5: Solve for x
    x = 910,545.42/917.43
  6. Step 6: Final answer
    x = 992.50

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1.5x scale

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.