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Finding the Fourth Proportional to 1,260.77, 1,739.48 and 788.72

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Solution

The fourth proportional to 1,260.77, 1,739.48 and 788.72 is: 1,088.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,260.77 : 1,739.48 = 788.72 : x
  2. Step 2: Convert to fraction form
    1,260.77/1,739.48 = 788.72/x
  3. Step 3: Cross multiply
    1,260.77x = 1,739.48 × 788.72
  4. Step 4: Simplify right side
    1,260.77x = 1,371,950.02
  5. Step 5: Solve for x
    x = 1,371,950.02/1,260.77
  6. Step 6: Final answer
    x = 1,088.19

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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.