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Finding the Fourth Proportional to 445,384.80, 668,077.20 and 390,088.80

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Solution

The fourth proportional to 445,384.80, 668,077.20 and 390,088.80 is: 585,133.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,384.80 : 668,077.20 = 390,088.80 : x
  2. Step 2: Convert to fraction form
    445,384.80/668,077.20 = 390,088.80/x
  3. Step 3: Cross multiply
    445,384.80x = 668,077.20 × 390,088.80
  4. Step 4: Simplify right side
    445,384.80x = 260,609,433,255.36
  5. Step 5: Solve for x
    x = 260,609,433,255.36/445,384.80
  6. Step 6: Final answer
    x = 585,133.20

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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.