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Finding the Fourth Proportional to 948.60, 1,309.24 and 555.60

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Solution

The fourth proportional to 948.60, 1,309.24 and 555.60 is: 766.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.60 : 1,309.24 = 555.60 : x
  2. Step 2: Convert to fraction form
    948.60/1,309.24 = 555.60/x
  3. Step 3: Cross multiply
    948.60x = 1,309.24 × 555.60
  4. Step 4: Simplify right side
    948.60x = 727,413.74
  5. Step 5: Solve for x
    x = 727,413.74/948.60
  6. Step 6: Final answer
    x = 766.83

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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.