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Finding the Fourth Proportional to 661,291.40, 912,681.72 and 403,318

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Solution

The fourth proportional to 661,291.40, 912,681.72 and 403,318 is: 556,639.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,291.40 : 912,681.72 = 403,318 : x
  2. Step 2: Convert to fraction form
    661,291.40/912,681.72 = 403,318/x
  3. Step 3: Cross multiply
    661,291.40x = 912,681.72 × 403,318
  4. Step 4: Simplify right side
    661,291.40x = 368,100,965,946.96
  5. Step 5: Solve for x
    x = 368,100,965,946.96/661,291.40
  6. Step 6: Final answer
    x = 556,639.58

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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.