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Finding the Fourth Proportional to 971.90, 1,341.45 and 678.07

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Solution

The fourth proportional to 971.90, 1,341.45 and 678.07 is: 935.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.90 : 1,341.45 = 678.07 : x
  2. Step 2: Convert to fraction form
    971.90/1,341.45 = 678.07/x
  3. Step 3: Cross multiply
    971.90x = 1,341.45 × 678.07
  4. Step 4: Simplify right side
    971.90x = 909,586.90
  5. Step 5: Solve for x
    x = 909,586.90/971.90
  6. Step 6: Final answer
    x = 935.89

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1.5x scale

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.