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Finding the Fourth Proportional to 1,402.79, 1,935.70 and 1,009.13

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Solution

The fourth proportional to 1,402.79, 1,935.70 and 1,009.13 is: 1,392.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.79 : 1,935.70 = 1,009.13 : x
  2. Step 2: Convert to fraction form
    1,402.79/1,935.70 = 1,009.13/x
  3. Step 3: Cross multiply
    1,402.79x = 1,935.70 × 1,009.13
  4. Step 4: Simplify right side
    1,402.79x = 1,953,360.74
  5. Step 5: Solve for x
    x = 1,953,360.74/1,402.79
  6. Step 6: Final answer
    x = 1,392.49

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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.