Home / 1,289.40-1,776.76-1,056.12

Finding the Fourth Proportional to 1,289.40, 1,776.76 and 1,056.12

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Solution

The fourth proportional to 1,289.40, 1,776.76 and 1,056.12 is: 1,455.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.40 : 1,776.76 = 1,056.12 : x
  2. Step 2: Convert to fraction form
    1,289.40/1,776.76 = 1,056.12/x
  3. Step 3: Cross multiply
    1,289.40x = 1,776.76 × 1,056.12
  4. Step 4: Simplify right side
    1,289.40x = 1,876,471.77
  5. Step 5: Solve for x
    x = 1,876,471.77/1,289.40
  6. Step 6: Final answer
    x = 1,455.31

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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.