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Finding the Fourth Proportional to 1,387.32, 1,913.90 and 835

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Solution

The fourth proportional to 1,387.32, 1,913.90 and 835 is: 1,151.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.32 : 1,913.90 = 835 : x
  2. Step 2: Convert to fraction form
    1,387.32/1,913.90 = 835/x
  3. Step 3: Cross multiply
    1,387.32x = 1,913.90 × 835
  4. Step 4: Simplify right side
    1,387.32x = 1,598,106.50
  5. Step 5: Solve for x
    x = 1,598,106.50/1,387.32
  6. Step 6: Final answer
    x = 1,151.94

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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.