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Finding the Fourth Proportional to 1,005.36, 1,386.72 and 591.36

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Solution

The fourth proportional to 1,005.36, 1,386.72 and 591.36 is: 815.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.36 : 1,386.72 = 591.36 : x
  2. Step 2: Convert to fraction form
    1,005.36/1,386.72 = 591.36/x
  3. Step 3: Cross multiply
    1,005.36x = 1,386.72 × 591.36
  4. Step 4: Simplify right side
    1,005.36x = 820,050.74
  5. Step 5: Solve for x
    x = 820,050.74/1,005.36
  6. Step 6: Final answer
    x = 815.68

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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.