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Finding the Fourth Proportional to 970.69, 1,339.57 and 551.01

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Solution

The fourth proportional to 970.69, 1,339.57 and 551.01 is: 760.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.69 : 1,339.57 = 551.01 : x
  2. Step 2: Convert to fraction form
    970.69/1,339.57 = 551.01/x
  3. Step 3: Cross multiply
    970.69x = 1,339.57 × 551.01
  4. Step 4: Simplify right side
    970.69x = 738,113.71
  5. Step 5: Solve for x
    x = 738,113.71/970.69
  6. Step 6: Final answer
    x = 760.40

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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.