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Finding the Fourth Proportional to 1,392.48, 1,921.20 and 977.76

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Solution

The fourth proportional to 1,392.48, 1,921.20 and 977.76 is: 1,349.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.48 : 1,921.20 = 977.76 : x
  2. Step 2: Convert to fraction form
    1,392.48/1,921.20 = 977.76/x
  3. Step 3: Cross multiply
    1,392.48x = 1,921.20 × 977.76
  4. Step 4: Simplify right side
    1,392.48x = 1,878,472.51
  5. Step 5: Solve for x
    x = 1,878,472.51/1,392.48
  6. Step 6: Final answer
    x = 1,349.01

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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.