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Finding the Fourth Proportional to 1,221,072, 1,685,079.36 and 684,528

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Solution

The fourth proportional to 1,221,072, 1,685,079.36 and 684,528 is: 944,648.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221,072 : 1,685,079.36 = 684,528 : x
  2. Step 2: Convert to fraction form
    1,221,072/1,685,079.36 = 684,528/x
  3. Step 3: Cross multiply
    1,221,072x = 1,685,079.36 × 684,528
  4. Step 4: Simplify right side
    1,221,072x = 1,153,484,004,142.08
  5. Step 5: Solve for x
    x = 1,153,484,004,142.08/1,221,072
  6. Step 6: Final answer
    x = 944,648.64

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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.