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Finding the Fourth Proportional to 918.76, 1,368.25 and 913.49

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Solution

The fourth proportional to 918.76, 1,368.25 and 913.49 is: 1,360.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.76 : 1,368.25 = 913.49 : x
  2. Step 2: Convert to fraction form
    918.76/1,368.25 = 913.49/x
  3. Step 3: Cross multiply
    918.76x = 1,368.25 × 913.49
  4. Step 4: Simplify right side
    918.76x = 1,249,882.69
  5. Step 5: Solve for x
    x = 1,249,882.69/918.76
  6. Step 6: Final answer
    x = 1,360.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.