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Finding the Fourth Proportional to 1,011.49, 1,392.16 and 971.16

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Solution

The fourth proportional to 1,011.49, 1,392.16 and 971.16 is: 1,336.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.49 : 1,392.16 = 971.16 : x
  2. Step 2: Convert to fraction form
    1,011.49/1,392.16 = 971.16/x
  3. Step 3: Cross multiply
    1,011.49x = 1,392.16 × 971.16
  4. Step 4: Simplify right side
    1,011.49x = 1,352,018.76
  5. Step 5: Solve for x
    x = 1,352,018.76/1,011.49
  6. Step 6: Final answer
    x = 1,336.66

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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.