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Finding the Fourth Proportional to 901.09, 1,240.35 and 777.16

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Solution

The fourth proportional to 901.09, 1,240.35 and 777.16 is: 1,069.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.09 : 1,240.35 = 777.16 : x
  2. Step 2: Convert to fraction form
    901.09/1,240.35 = 777.16/x
  3. Step 3: Cross multiply
    901.09x = 1,240.35 × 777.16
  4. Step 4: Simplify right side
    901.09x = 963,950.41
  5. Step 5: Solve for x
    x = 963,950.41/901.09
  6. Step 6: Final answer
    x = 1,069.76

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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.