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Finding the Fourth Proportional to 660,802.70, 911,890.01 and 388,886.61

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Solution

The fourth proportional to 660,802.70, 911,890.01 and 388,886.61 is: 536,653.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,802.70 : 911,890.01 = 388,886.61 : x
  2. Step 2: Convert to fraction form
    660,802.70/911,890.01 = 388,886.61/x
  3. Step 3: Cross multiply
    660,802.70x = 911,890.01 × 388,886.61
  4. Step 4: Simplify right side
    660,802.70x = 354,621,812,737.33
  5. Step 5: Solve for x
    x = 354,621,812,737.33/660,802.70
  6. Step 6: Final answer
    x = 536,653.10

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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.