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Finding the Fourth Proportional to 660,155, 990,359.76 and 281,068.70

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Solution

The fourth proportional to 660,155, 990,359.76 and 281,068.70 is: 421,657.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,155 : 990,359.76 = 281,068.70 : x
  2. Step 2: Convert to fraction form
    660,155/990,359.76 = 281,068.70/x
  3. Step 3: Cross multiply
    660,155x = 990,359.76 × 281,068.70
  4. Step 4: Simplify right side
    660,155x = 278,359,130,275.51
  5. Step 5: Solve for x
    x = 278,359,130,275.51/660,155
  6. Step 6: Final answer
    x = 421,657.23

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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.