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Finding the Fourth Proportional to 720.36, 1,075.32 and 647.28

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Solution

The fourth proportional to 720.36, 1,075.32 and 647.28 is: 966.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.36 : 1,075.32 = 647.28 : x
  2. Step 2: Convert to fraction form
    720.36/1,075.32 = 647.28/x
  3. Step 3: Cross multiply
    720.36x = 1,075.32 × 647.28
  4. Step 4: Simplify right side
    720.36x = 696,033.13
  5. Step 5: Solve for x
    x = 696,033.13/720.36
  6. Step 6: Final answer
    x = 966.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.