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Finding the Fourth Proportional to 970.84, 1,339.78 and 551.20

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Solution

The fourth proportional to 970.84, 1,339.78 and 551.20 is: 760.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.84 : 1,339.78 = 551.20 : x
  2. Step 2: Convert to fraction form
    970.84/1,339.78 = 551.20/x
  3. Step 3: Cross multiply
    970.84x = 1,339.78 × 551.20
  4. Step 4: Simplify right side
    970.84x = 738,486.74
  5. Step 5: Solve for x
    x = 738,486.74/970.84
  6. Step 6: Final answer
    x = 760.67

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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.