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Finding the Fourth Proportional to 1,355.94, 1,871.64 and 913.68

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Solution

The fourth proportional to 1,355.94, 1,871.64 and 913.68 is: 1,261.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.94 : 1,871.64 = 913.68 : x
  2. Step 2: Convert to fraction form
    1,355.94/1,871.64 = 913.68/x
  3. Step 3: Cross multiply
    1,355.94x = 1,871.64 × 913.68
  4. Step 4: Simplify right side
    1,355.94x = 1,710,080.04
  5. Step 5: Solve for x
    x = 1,710,080.04/1,355.94
  6. Step 6: Final answer
    x = 1,261.18

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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.