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Finding the Fourth Proportional to 1,400.12, 1,931.94 and 840.50

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Solution

The fourth proportional to 1,400.12, 1,931.94 and 840.50 is: 1,159.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.12 : 1,931.94 = 840.50 : x
  2. Step 2: Convert to fraction form
    1,400.12/1,931.94 = 840.50/x
  3. Step 3: Cross multiply
    1,400.12x = 1,931.94 × 840.50
  4. Step 4: Simplify right side
    1,400.12x = 1,623,795.57
  5. Step 5: Solve for x
    x = 1,623,795.57/1,400.12
  6. Step 6: Final answer
    x = 1,159.75

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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.