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Finding the Fourth Proportional to 1,415.84, 1,953.85 and 777.79

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Solution

The fourth proportional to 1,415.84, 1,953.85 and 777.79 is: 1,073.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.84 : 1,953.85 = 777.79 : x
  2. Step 2: Convert to fraction form
    1,415.84/1,953.85 = 777.79/x
  3. Step 3: Cross multiply
    1,415.84x = 1,953.85 × 777.79
  4. Step 4: Simplify right side
    1,415.84x = 1,519,678.16
  5. Step 5: Solve for x
    x = 1,519,678.16/1,415.84
  6. Step 6: Final answer
    x = 1,073.34

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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.