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Finding the Fourth Proportional to 1,506.40, 2,078.08 and 917.12

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Solution

The fourth proportional to 1,506.40, 2,078.08 and 917.12 is: 1,265.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,506.40 : 2,078.08 = 917.12 : x
  2. Step 2: Convert to fraction form
    1,506.40/2,078.08 = 917.12/x
  3. Step 3: Cross multiply
    1,506.40x = 2,078.08 × 917.12
  4. Step 4: Simplify right side
    1,506.40x = 1,905,848.73
  5. Step 5: Solve for x
    x = 1,905,848.73/1,506.40
  6. Step 6: Final answer
    x = 1,265.17

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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.