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Finding the Fourth Proportional to 995.16, 1,491.28 and 561.40

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Solution

The fourth proportional to 995.16, 1,491.28 and 561.40 is: 841.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.16 : 1,491.28 = 561.40 : x
  2. Step 2: Convert to fraction form
    995.16/1,491.28 = 561.40/x
  3. Step 3: Cross multiply
    995.16x = 1,491.28 × 561.40
  4. Step 4: Simplify right side
    995.16x = 837,204.59
  5. Step 5: Solve for x
    x = 837,204.59/995.16
  6. Step 6: Final answer
    x = 841.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.