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Finding the Fourth Proportional to 660,021.20, 989,837.40 and 260,529.20

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Solution

The fourth proportional to 660,021.20, 989,837.40 and 260,529.20 is: 390,717.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,021.20 : 989,837.40 = 260,529.20 : x
  2. Step 2: Convert to fraction form
    660,021.20/989,837.40 = 260,529.20/x
  3. Step 3: Cross multiply
    660,021.20x = 989,837.40 × 260,529.20
  4. Step 4: Simplify right side
    660,021.20x = 257,881,545,952.08
  5. Step 5: Solve for x
    x = 257,881,545,952.08/660,021.20
  6. Step 6: Final answer
    x = 390,717.06

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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.