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Finding the Fourth Proportional to 660,289.23, 911,416.19 and 388,345.50

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Solution

The fourth proportional to 660,289.23, 911,416.19 and 388,345.50 is: 536,044.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,289.23 : 911,416.19 = 388,345.50 : x
  2. Step 2: Convert to fraction form
    660,289.23/911,416.19 = 388,345.50/x
  3. Step 3: Cross multiply
    660,289.23x = 911,416.19 × 388,345.50
  4. Step 4: Simplify right side
    660,289.23x = 353,944,374,071.92
  5. Step 5: Solve for x
    x = 353,944,374,071.92/660,289.23
  6. Step 6: Final answer
    x = 536,044.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.