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Finding the Fourth Proportional to 1,355.16, 1,870 and 765.58

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Solution

The fourth proportional to 1,355.16, 1,870 and 765.58 is: 1,056.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.16 : 1,870 = 765.58 : x
  2. Step 2: Convert to fraction form
    1,355.16/1,870 = 765.58/x
  3. Step 3: Cross multiply
    1,355.16x = 1,870 × 765.58
  4. Step 4: Simplify right side
    1,355.16x = 1,431,634.60
  5. Step 5: Solve for x
    x = 1,431,634.60/1,355.16
  6. Step 6: Final answer
    x = 1,056.43

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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.