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Finding the Fourth Proportional to 639,711.80, 959,130.30 and 302,913.80

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Solution

The fourth proportional to 639,711.80, 959,130.30 and 302,913.80 is: 454,163.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,711.80 : 959,130.30 = 302,913.80 : x
  2. Step 2: Convert to fraction form
    639,711.80/959,130.30 = 302,913.80/x
  3. Step 3: Cross multiply
    639,711.80x = 959,130.30 × 302,913.80
  4. Step 4: Simplify right side
    639,711.80x = 290,533,803,868.14
  5. Step 5: Solve for x
    x = 290,533,803,868.14/639,711.80
  6. Step 6: Final answer
    x = 454,163.58

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Double scale
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1.5x scale

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.