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Finding the Fourth Proportional to 1,271.47, 1,905.54 and 784.84

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Solution

The fourth proportional to 1,271.47, 1,905.54 and 784.84 is: 1,176.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.47 : 1,905.54 = 784.84 : x
  2. Step 2: Convert to fraction form
    1,271.47/1,905.54 = 784.84/x
  3. Step 3: Cross multiply
    1,271.47x = 1,905.54 × 784.84
  4. Step 4: Simplify right side
    1,271.47x = 1,495,544.01
  5. Step 5: Solve for x
    x = 1,495,544.01/1,271.47
  6. Step 6: Final answer
    x = 1,176.23

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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.