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Finding the Fourth Proportional to 912,908.70, 1,280,171.70 and 912,908.70

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Solution

The fourth proportional to 912,908.70, 1,280,171.70 and 912,908.70 is: 1,280,171.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    912,908.70 : 1,280,171.70 = 912,908.70 : x
  2. Step 2: Convert to fraction form
    912,908.70/1,280,171.70 = 912,908.70/x
  3. Step 3: Cross multiply
    912,908.70x = 1,280,171.70 × 912,908.70
  4. Step 4: Simplify right side
    912,908.70x = 1,168,679,882,423.79
  5. Step 5: Solve for x
    x = 1,168,679,882,423.79/912,908.70
  6. Step 6: Final answer
    x = 1,280,171.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.