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Finding the Fourth Proportional to 897.50, 1,345.80 and 312.26

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Solution

The fourth proportional to 897.50, 1,345.80 and 312.26 is: 468.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    897.50 : 1,345.80 = 312.26 : x
  2. Step 2: Convert to fraction form
    897.50/1,345.80 = 312.26/x
  3. Step 3: Cross multiply
    897.50x = 1,345.80 × 312.26
  4. Step 4: Simplify right side
    897.50x = 420,239.51
  5. Step 5: Solve for x
    x = 420,239.51/897.50
  6. Step 6: Final answer
    x = 468.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.