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Finding the Fourth Proportional to 1,509.40, 2,265.50 and 644.32

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Solution

The fourth proportional to 1,509.40, 2,265.50 and 644.32 is: 967.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,509.40 : 2,265.50 = 644.32 : x
  2. Step 2: Convert to fraction form
    1,509.40/2,265.50 = 644.32/x
  3. Step 3: Cross multiply
    1,509.40x = 2,265.50 × 644.32
  4. Step 4: Simplify right side
    1,509.40x = 1,459,706.96
  5. Step 5: Solve for x
    x = 1,459,706.96/1,509.40
  6. Step 6: Final answer
    x = 967.08

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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.