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Finding the Fourth Proportional to 970.74, 1,455.48 and 645.48

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Solution

The fourth proportional to 970.74, 1,455.48 and 645.48 is: 967.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.74 : 1,455.48 = 645.48 : x
  2. Step 2: Convert to fraction form
    970.74/1,455.48 = 645.48/x
  3. Step 3: Cross multiply
    970.74x = 1,455.48 × 645.48
  4. Step 4: Simplify right side
    970.74x = 939,483.23
  5. Step 5: Solve for x
    x = 939,483.23/970.74
  6. Step 6: Final answer
    x = 967.80

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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.