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Finding the Fourth Proportional to 720,465,506.48, 994,243,248.96 and 390,440,645.48

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Solution

The fourth proportional to 720,465,506.48, 994,243,248.96 and 390,440,645.48 is: 538,808,551.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,465,506.48 : 994,243,248.96 = 390,440,645.48 : x
  2. Step 2: Convert to fraction form
    720,465,506.48/994,243,248.96 = 390,440,645.48/x
  3. Step 3: Cross multiply
    720,465,506.48x = 994,243,248.96 × 390,440,645.48
  4. Step 4: Simplify right side
    720,465,506.48x = 388,192,975,888,074,752
  5. Step 5: Solve for x
    x = 388,192,975,888,074,752/720,465,506.48
  6. Step 6: Final answer
    x = 538,808,551.41

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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.