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Finding the Fourth Proportional to 898.35, 1,239.67 and 505.35

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Solution

The fourth proportional to 898.35, 1,239.67 and 505.35 is: 697.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.35 : 1,239.67 = 505.35 : x
  2. Step 2: Convert to fraction form
    898.35/1,239.67 = 505.35/x
  3. Step 3: Cross multiply
    898.35x = 1,239.67 × 505.35
  4. Step 4: Simplify right side
    898.35x = 626,458.51
  5. Step 5: Solve for x
    x = 626,458.51/898.35
  6. Step 6: Final answer
    x = 697.34

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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.