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Finding the Fourth Proportional to 660,031.43, 990,038.78 and 210,746.60

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Solution

The fourth proportional to 660,031.43, 990,038.78 and 210,746.60 is: 316,117.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,031.43 : 990,038.78 = 210,746.60 : x
  2. Step 2: Convert to fraction form
    660,031.43/990,038.78 = 210,746.60/x
  3. Step 3: Cross multiply
    660,031.43x = 990,038.78 × 210,746.60
  4. Step 4: Simplify right side
    660,031.43x = 208,647,300,749.22
  5. Step 5: Solve for x
    x = 208,647,300,749.22/660,031.43
  6. Step 6: Final answer
    x = 316,117.22

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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.